The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.

• AJAX‏‎ (7 members)
• AMC Academic Moodle Cooperation‏‎ (6 members)
• About Moodle‏‎ (19 members)
• Accessibility‏‎ (5 members)
• Accounts‏‎ (14 members)
• Activity modules‏‎ (19 members)
• Add-on‏‎ (32 members)
• Administrator‏‎ (49 members)
• Assignment‏‎ (20 members)
• Audio‏‎ (6 members)
• Authentication‏‎ (30 members)
• Backup‏‎ (47 members)
• Badges‏‎ (20 members)
• Biology‏‎ (2 members)
• Block‏‎ (140 members)
• Blocks‏‎ (4 members)
• Blog‏‎ (21 members)
• Book‏‎ (11 members)
• Calendar‏‎ (15 members)
• Capabilities‏‎ (542 members)
• Certificate‏‎ (6 members)
• Chat‏‎ (9 members)
• Chemistry‏‎ (19 members)
• Choice‏‎ (8 members)
• Coding guidelines‏‎ (14 members)
• Comments‏‎ (8 members)
• Common Cartridge‏‎ (1 member)
• Completion‏‎ (18 members)
• Conditional activities‏‎ (3 members)
• Constructivism‏‎ (0 members)
• Contributed code‏‎ (322 members)
• Course‏‎ (67 members)
• Course format‏‎ (5 members)
• Credits‏‎ (1 member)
• DB‏‎ (18 members)
• Database‏‎ (0 members)
• Database activity module‏‎ (28 members)
• Dataform module‏‎ (72 members)
• Datalynx module‏‎ (19 members)
• Developer‏‎ (217 members)
• Developer tools‏‎ (12 members)
• Disambiguation‏‎ (10 members)
• Discipline-specific Moodling‏‎ (9 members)
• ELIS‏‎ (29 members)
• ELIS Admin‏‎ (12 members)
• ELIS Programs‏‎ (6 members)
• ELIS Users‏‎ (3 members)
• Editing text‏‎ (9 members)
• Enrolment‏‎ (57 members)
• Environment‏‎ (31 members)